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fix(029_03,039_04): partial notification fragment is a valid recursive-merge update (204)
A (CSR) Subscription update fragment changing only notification.format
({"notification":{"format":"keyValues"}}) is applied via TS 104-175 clause 8.4.2
"Partial update patch behaviour" — an algorithm equivalent to IETF RFC 7396
(recursive JSON Merge Patch) — so it deep-merges into the stored notification,
preserving the mandatory endpoint, and returns 204. It is not an invalid
fragment. 029_03 asserts 204; 039_04 is split so InvalidType still asserts 400
while the partial-notification case asserts 204.